Analog And Digital Electronics

Step 1: Understanding the Concept:
The circuit consists of three logic gates.
The first gate (top) is an AND gate with inputs and .
The second gate (bottom) is an OR gate with inputs and .
The third gate (right) is a NAND gate that takes the outputs of the first two gates as its inputs.
Step 2: Key Formula or Approach:
Let be the output of the AND gate: .
Let be the output of the OR gate: .
The final output is the NAND of and :

Step 3: Detailed Explanation:
Let's evaluate the output for each input pair:
1. For : , . Output .
2. For : , . Output .
3. For : , . Output .
4. For : , . Output .
The resulting sequence of outputs is 1, 1, 1, 0.
Step 4: Final Answer:
The sequence for the given inputs is 1, 1, 1, 0.

Concept: The circuit in part (A) contains:

• An ideal diode
• A Zener diode with breakdown voltage V

The output waveform shows clipping at: Thus the circuit behaves like a bidirectional voltage limiter.
Step 1:Analyze positive half cycle} During positive input:

• Zener diode reaches breakdown at V.
• Output voltage is limited to V.

Step 2:Analyze negative half cycle} During negative input:

• The other diode conducts normally.
• Voltage is limited to V.

Step 3:Equivalent circuit} Such symmetrical clipping occurs when two diodes are connected in opposite directions between and . Thus the correct option corresponds to:

Concept: Use properties of universal gates and De Morgan's theorem: Also note that a NAND gate with both inputs same acts as a NOT gate. Step 1: Analyze the first stage.} Each input passes through a NAND gate whose inputs are tied together. Thus, So outputs of first stage are: Step 2: Second stage NAND operation.} These inputs go to a NAND gate: Using De Morgan's theorem: Step 3: Final gate.} The last gate is again a NAND with both inputs tied together, which acts as a NOT gate: Thus the final output becomes: which is the function of an OR gate.